Welcome to the Cisco Networking Professionals Ask the Expert conversation for small and medium business. For a one-week period, small and medium business and technology leaders and Cisco engineers are available to continue discussing issues and ideas from scheduled live web broadcasts. This is an opportunity to learn with experts Jake Woodhams and Jimmy Ray Purser how the Cisco Unified Wireless Network helps solve critical issues. Jake is an expert in next generation WLAN technologies and their advanced services. He has been working with the Wireless Networking Business Unit at Cisco for over 4 years. Recently, he has been focusing on integrating the technology from the acquisition of Airespace Networks into the Cisco WLAN portfolio. Jimmy, a hands-on engineer with over 16 years of field experience, has planned and implemented WAN, LAN, WLAN solutions for organizations such as Fortune 500 companies, U.S. and NATO armed forces, organizations using Supervisory Control and Data Acquisition (SCADA) systems, and Internet-based businesses. As a Cisco Techwise TV product expert, Jimmy specializes in foundational technologies such as wireless networking, routing, and switching.
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Great question! Around 16K counting your normal overhead from IP. I normally use as a rule of thumb 20K. Taking this out a touch further, that means you can get around 75 calls at the same time on a T1 line. So figure:
20K(per call) /1.544 (T1 speed) = 77.2 total calls.
Of course the number (20K) depends on the compression chosen. Also, that is calls only on that T1, start surfing the web and your bandwidth drops accordingly.
As for IM, The AOL type of IM really does not interact nor is it prevented, however, if you are using Microsoft's Live Communitication Server, then along with Cisco's awesome Unified Presence Server, you would have a VOIP-IM combo that would be hard to beat and works excellent!!
I use the OSI model for designing my networks. For example at layer 1 I focus on power.
With VOIP phones, power is the big thing. Not just to the phone itself but to the switches also. Remember that a standard PBX receives its power "off of the grid" that is reason way phones still work in a power outage.
Make sure your entire VOIP solution is on a some sort of emergency power/generator. AND TEST IT MONTHLY!!!!! Then look at layer 2 redundant sup cards, STP bridging plans, etc...
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